Anderson localisation for an interacting two-particle quantum system on $\mathbb{Z}$

Abstract

We study spectral properties of a system of two quantum particles on an integer lattice with a bounded short-range two-body interaction, in an external random potential field $V(x,\omega )$ with independent, identically distributed values. The main result is that if the common probability density $f$ of random variables $V(x,\omega )$ is analytic in a strip around the real line and the amplitude constant $g$ is large enough (i.e. the system is at high disorder), then, with probability one, the spectrum of the two-particle lattice Schroedinger operator $H(\omega )$ (bosonic or fermionic) is pure point, and all eigen-functions decay exponentially. The proof given in this paper is based on a refinement of a multiscale analysis (MSA) scheme proposed by von Dreifus and Klein, adapted to incorporate lattice systems with interaction.

38 pages; main results have been reported earlier on international conferences

Cited by in corpus (1)

• A simple extension of Stollmann's lemma to correlated potentials